村长，是不是Costco 的油不经烧。跑个长途就能感觉到。

[zhzh]

统计数据需要eliminate variable。你这些variable太多。

这种耗油量更多体现的是汽油里面添加了多少的Ethanol。15%跟5%能差很多。汽油里面ethanol越多利润margin越高，便宜的汽油里面ethanol高倒是有可能的。

Shell 91 contain 0% ethanol, where available.

我还以为每家的９１号油都不含ethanol，每家的８７号都含１０％

 

[月下独酌]

汽油里面ethanol越多利润margin越高，便宜的汽油里面ethanol高倒是有可能的。.....对头。。。乙醇燃烧值才多少啊，没法和环烃比。

10% ethanol 差不多就是3%less mpg
15%ethanol就5% mpg了

再加上各种乱七八糟别的additive

有些地方汽油里面没ethanol, 比方说德国车，所以车设计的时候就没有考虑到ethanol带来的伤害（ethanol is dry and bad for seals）。
宝马335的高压泵门就是这原因。据说riven爽过很多次了。

 

[月下独酌]

我还以为每家的９１号油都不含ethanol，每家的８７号都含１０％

no,

每家不一样，有的87有15%

 

[资深爱地]

10% ethanol 差不多就是3%less mpg
15%ethanol就5% mpg了

再加上各种乱七八糟别的additive

有些地方汽油里面没ethanol, 比方说德国车，所以车设计的时候就没有考虑到ethanol带来的伤害（ethanol is dry and bad for seals）。
宝马335的高压泵门就是这原因。据说riven爽过很多次了。

我查了查，就Shell91 说No Ethanol
Petro94 也含Ethanol
月下， 那你484只用Shell呀，这个很重要，我要跟月下风

 

[苦逼热狗]

Petro Canada http://retail.petro-canada.ca/en/fuelsavings/143.aspx

• Ethanol-blended gasoline

Ethanol-blended gasoline is a fuel that typically contains up to 10% ethanol in unleaded gasoline. We use ethanol in our gasoline where legislation requires its use and where conditions warrant. The Federal Government has regulated that motor gasoline sold in Canada after Sept. 1, 2010 must contain an annual pool average of 5% ethanol. Different provincial mandates also exist, some with higher ethanol pool requirements. Because of these mandates, most grades of Petro-Canada fuel may now contain up to 10% ethanol. This represents a change from the previous state, where premium fuel was ethanol-free at Petro-Canada. To find out if ethanol-blended gasoline is sold at a station look for the yellow labels in the pump area indicating that the fuel may contain a maximum of 10% ethanol.​

 

[zhzh]

not sure this ethanol-free gas station list is still valid:

• Ontario: Shell V-Power 91; Costco 91; Canadian Tire 91; Esso 91; Ultramar 91 are all pure.

 

[mayo_wang]

宝马335的高压泵门就是这原因。据说riven爽过很多次了。

 

[月下独酌]

我查了查，就Shell91 说No Ethanol
Petro94 也含Ethanol
月下， 那你484只用Shell呀，这个很重要，我要跟月下风

恩我只用shell
就冲着这个去的。ethanol很伤高压油泵

 

[月下独酌]

Petro Canada http://retail.petro-canada.ca/en/fuelsavings/143.aspx

• Ethanol-blended gasoline

Ethanol-blended gasoline is a fuel that typically contains up to 10% ethanol in unleaded gasoline. We use ethanol in our gasoline where legislation requires its use and where conditions warrant. The Federal Government has regulated that motor gasoline sold in Canada after Sept. 1, 2010 must contain an annual pool average of 5% ethanol. Different provincial mandates also exist, some with higher ethanol pool requirements. Because of these mandates, most grades of Petro-Canada fuel may now contain up to 10% ethanol. This represents a change from the previous state, where premium fuel was ethanol-free at Petro-Canada. To find out if ethanol-blended gasoline is sold at a station look for the yellow labels in the pump area indicating that the fuel may contain a maximum of 10% ethanol.​

5% 规定是by volume average

所以Shell是10% 87, 5% 89, 0% 91，照样符合规定

 

[ccc]

耐跑的话，我个人感觉（还不敢100%打包票）91Shell特别耐跑，不比94Petro差

94Petro与91Petro只差2森特，划算

根据我以往的经验，是这样。
不过，我那车设计吃粗粮，给它细粮吃会不会有问题。手册上说87 and up 。

 

[ccc]

5% 规定是by volume average

所以Shell是10% 87, 5% 89, 0% 91，照样符合规定

我那车设计吃粗粮，给它细粮吃会不会有问题。手册上说87 and up 。

 

[月下独酌]

根据我以往的经验，是这样。
不过，我那车设计吃粗粮，给它细粮吃会不会有问题。手册上说87 and up 。

不会有任何问题，但是也不会有任何好处。

 

[ccc]

不会有任何问题，但是也不会有任何好处。

Shell 91，0% ethanol是不是对发动机等会有好处，或者说一箱油能多跑几公里呢。简单说，是不是值得。

我感觉意义不大，所以一直加87的油。

 

[月下独酌]

汽油高标号只是抗爆性好，是为了高压缩比的发动机在compression stroke的时候油气混合体不会在TDC点火之前自爆（由于压力/heat）而产生Engine knock.

并不是说有更多的energy

从turbo车的角度来说，更高的汽油标号，可以跑更高的boost。现在的turbo车都自动控制boost pressure, 所以用好一点的油可以小幅度提升马力，增加mpg...

 

[月下独酌]

Shell 91，0% ethanol是不是对发动机等会有好处，或者说一箱油能多跑几公里呢。简单说，是不是值得。

我感觉意义不大，所以一直加87的油。

如果车没要求，不值。